Extended Data Fig. 5: QPE energy dependence.
From: Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus
a, The QPE amplitude (A = N/C) as a function of energy. The maximum A = 93 ± 14 is reached in the 0.6–0.8 keV band. b, N = N(E) and C = C(E), after normalizing them to the detector effective area in each energy bin, that is, the QPE peak (N) and quiescent-level (C) photon spectra. c, d, The QPE duration Tdur (c) and QPE peak time delay ΔTpeak (d) as a function of energy, together with the best-fitting linear relations (see Methods section ‘QPE model-independent properties’). The peak time delay is computed with respect to the full 0.2–2 keV light curve, and the resulting lags are shifted so that the 0.8–1 keV band has zero delay. Errors represent the 1σ confidence intervals, some of the error bars being smaller than the symbol size.
